- For other uses, see Relentless.
- For other uses, see NCC-1745.
In the mirror universe, the ISS Relentless (NCC-1745) was a Constitution-class (Enterprise-subclass) heavy cruiser starship in the service of the Terran Empire's Imperial Starfleet in the early 2290s.
In 2293, the Relentless was part of the Terran reinforcements attacking the ISS Excelsior and its Romulan escorts near the Tholian border. (TOS video game: Shattered Universe mission "Sunstorm")
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